I think it is the case, and what we're seeing online is chaff and noise and not reflective of what most American adults believe. Maybe it's Russian bots or whatever. Or children from Reddit. Or Europeans trying to dictate what they think American politics should be about. But it is true that the one thing that we (American adults) more often agree on than not are the rights spelled out in the Bill of Rights.

Not really, no. Islamic terrorist propaganda has been banned for a while, and before that there was the Red scare era, where it was (and still is) illegal to be in the Communist party. Plus you had all the McCarthyism. Let us not also forget the Civil rights era, and all who were silenced and even killed for their speech then.

So I'm not really sure what time period you refer to where there was truly free speech in America?